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Mon, Jun 14, 10 at 3:15
| I just bought a John Deere 425 with the 20HP Kawasaki FD620D liquid cooled engine with 1700 hrs on it that has a stripped cam gear (I'm assuming that's what it is, its freewheeling like a car will do with a broken timing belt). I am wondering because of the high running time on this engine if I should give it a complete rebuild when I replace the gear. Is there any way to tell if it needs other parts replaced without pulling the heads or tearing it all the way down? This is the first time that I have seen one of these model engines so I know nothing about them. By reading this forum I have learned that there are steel gears to replace the plastic ones. Looking at the parts sites it looks like the cam gear and camshaft are sold as one piece. Is this correct or do the sell them separately. I have a press so I can press them on and off. I haven't gotten the tractor home yet and I haven't taken the front cover off yet so I am not sure if there is other damage or not. I'm just trying to get some insight before I tear into it. I'm hoping that you can give me some pointers on what to look for to see if I should tear into it further. I've read some very good informative results to others problems from a few of you gentlemen that are helping use "dummies" solve our problems that we can't seem to solve on our own. I would like to tell you that you are giving a great service and let you know that that many of us back yard mechanics DO APPRECIATE YOUR HELP. I hope that you are or will be awarded equivalently.
thanks and keep up the good work Stan |
Follow-Up Postings:
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| There are a "handful" of genuine Deere/Kaw experts in this forum (I'm not one) and you should follow their advice/suggestions/tips to the letter. Now for my opinion: At 1,700 + hours you are getting prepared to put it into service (or whatever your plans). I recommend that you pull the heads and replace the head gaskets as a minimum inspection/diagnosis procedure. The head gaskets (if the originals) probably need replacing anyhow. Getting the heads off will permit you to examine the cylinder walls, piston tops, and the underside of heads. I also recommend a new thermostat and waterpump, along with radiator clean out and new radiator cap. These would be the minimum steps to take (in my opinion) before putting the engine back into service. |
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| thanks for the advise mownie. I initially was hoping I would not have to pull the heads or tear down more than necessary, but after your response I thought about it and decided that as the 425 is such a good machine that it is worthy of the extra work to be assured that it is adequate for another long duration. I'm sure that after 1700 hrs on a gasoline engine it would probably have some wear on it. The outside of the engine looks very good, not very dirty and no oily spots. Since this is the first Kawasaki I have worked on and going by its looks I am assuming that these Kawasaki engines must be good and well designed. I hope there is some of you Deere/Kawasaki experienced mechanics that have gone through the 20hp Kawasaki engines will look at this thread and give me some more well needed advise on what is the normal wear patterns of this model engine. I will follow your advise and see what the top of the pistons and cylinder walls look like and lap the valves. With no more trouble than it would be I think it would be a good idea to go ahead and install new rings as well. Do you put a new cross-hatch on the cylinder walls when installing new rings on these small engines? Does anyone know a site where I can get the specs on the Kawasaki 20hp water cooled engine? Again I thank for your kindness and advise Stan |
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- Posted by Bluehorse54 (My Page) on Tue, Aug 23, 11 at 16:00
| Say I just ran into the same issue broke cam gear on my 425 JD, where can I find a manual how to change it out , anyone know, got the water pump off not sure where to go from there all the case bolts are out except motor mount, do i need to replace the seal over the crank? |
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| gimmodog/Bluehoese54, Same problem with a JD 425 bought last weekend. Appears to have jumped time while unloading off trailer. Pulled valve covers and no movement with lifters when engine turning over. Either of you find information to your above questions? Appreciate any help. robb1234 |
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